Lens Testing - Doing your own simple lens tests
This article has been superseded by a longer and more detailed series of articles on how to evaluate a lens. You can read those articles starting HERE
Here is the original article: ...
A simple lens cleaning kit, consisting of a detergent, microfiber cloth, and an anti-dust airbrush.
Leica III lens.
Some notable photographic optical lens designs are: ...
Generally a simple lens used to collect light and concentrate it on a particular area, as in enlarger or projector. Frequently in the form of two planoconvex lenses in a metal housing.
Convex lens - simple lens which causes rays of light from a subject to converge and form an image.
Convex lens
Simple lens, or lens shape within a compound lens, whose surfaces curve outward. Such a lens causes rays of light passing through it to converge.
(see Compound lens) ...
The simplest form of Ramsden consists of two identical simple lenses, each flat on one side and convex on the other, facing each other with convex sides inward, spaced apart by a distance equal to or slightly less than their focal length.
Aberration in simple lenses is sub-categorized into seven types:
Astigmatism - lines in some directions are focused less sharply than lines in other directions, ...
(PIA) LENS ELEMENTS-Individual simple lenses that are combined to form a compound lens. (PIA) LIGHT, AMBIENT-Surrounding light; the general room illumination or light level.
The principal point of a simple lens is located at the center of the lens. Compound lenses have two principal points, the location of which cannot be determined by appearance.
In a simple lens the distance (typically in millimeters) between the lens and the position of a sharp image for a subject a great distance away.
Meniscus lens
Is a simple lens consisting of a single piece off glass, thicker at the center than at the edges. It has one concave and one convex face.
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More Photographic Terms ...
However, bear in mind the formulas were derived for the ultimate theoretical simple lens, not the sophisticated zoom and telephoto lenses we now use.
They typically are focused by extension (simple mechanism), don't require aspheric elements (simple lens element shapes), they don't require elements made of glass with anomalous dispersion (simple materials), ...
fisheye lens database
macro lens database
Simple lens tests are found at this Kiev 60 page
history of small format film lenses
Interchangeable non-AF lenses: an attempt of clasification, at Manual Camera ...
This is actually a complicated optical trick, since a simple lens really wants to project an image onto a spherical surface (such as the interior of the human eyeball).
It is surely a problem to compare the different solutions from the various manufacturers because concrete information are very rare and difficult to interpret. Nonetheless even using a simple lens hood reduces the flare problems significantly.
However, like any other old lens, they accumulate dust, fingerprints, and other nasties internally; and sometimes the aperture blades can get sticky. Fortunately, it's a very simple lens to strip and rebuild. Here's how.
Wide angle images remain absolutely rectilinear. On the other hand, pinhole images suffer from greater chromatic aberration than pictures made with a simple lens, and they tolerate little enlargement.
In practical photography, compound lenses made of a number of elements of different types of glass are used. This enables the manufacturer to correct most of the faults (aberrations) found in simple lenses and provide images that are sharp across ...
 See also: Lens, Lenses, Camera, Focal, Film
  
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